AUMA SQEx Explosion-Proof Part-Turn Actuator (ATEX)
Overview: Certified Quarter-Turn Automation for Hazardous Areas
The AUMA SQEx Explosion-Proof Part-Turn Actuator brings the same explosion-protected construction found in AUMA’s SAEx multi-turn range to quarter-turn valve automation, giving ball and butterfly valves in classified hazardous areas a certified actuation solution that will not act as an ignition source. Like other AUMA Ex-rated devices, the SQEx is engineered so that constructive measures prevent the occurrence of ignition sparks or hot surfaces, with certification performed in close collaboration with national and international certification bodies.
As a trusted supplier of AUMA valve actuators, Seven Star LLC sources and supplies the SQEx explosion-proof part-turn actuator to refineries, gas processing plants, and petrochemical facilities across Oman and the wider GCC. Because hazardous-area quarter-turn valve automation is a frequent requirement across process plant tank farms, pipeline manifolds, and offshore facilities, Seven Star LLC helps engineering teams specify the correct SQEx configuration for their classified zone.
Working Principle: Explosion-Protected Quarter-Turn Actuation
The SQEx drives a valve stem through its rotational swing angle – typically 75° to 105° – using a three-phase AC motor, with limit and torque seating providing precise end-of-travel stopping for both electrical operation and handwheel manual operation. A mechanical position indicator gives local visual confirmation of valve position directly at the actuator, independent of any remote signaling to the control room.
The actuator’s explosion-protected construction houses motor windings, switch compartments, and terminal areas within flameproof or increased-safety enclosures rated for the classified zone, ensuring that even an internal electrical fault cannot become an ignition source for the surrounding atmosphere. For plants requiring modulating rather than simple open-close duty, the SQREx variant within the same platform provides Class C modulating performance while retaining the same explosion-protected housing design.
Engineering Design of the SQEx Actuator
The SQEx is built to IP68 protection standard with an ISO 5211 output flange for direct mechanical compatibility with standard butterfly and ball valves, and covers a torque range of approximately 50 to 2,400 Nm with rotation angles from 75° to 105° and operating times from roughly 4 to 100 seconds for a 90° travel. High enclosure protection and high-quality corrosion protection support reliable field operation, with a standard ambient temperature rating of -30°C to +60°C.
Options for the SQEx include intermediate position switches, tandem-version switches, remote position transmitters, and magnetic limit and torque transmitters, allowing the actuator to integrate with plant control and monitoring systems beyond the basic open-close signal. For integral local control, the AUMA MATIC ACExC 01.2 actuator controls pairing is available for the SQEx/SQREx 05.2 to 14.2 size range.
Key Features
The AUMA SQEx Explosion-Proof Part-Turn Actuator delivers certified hazardous-area quarter-turn automation. Key characteristics include:
- Explosion-proof construction certified for installation in classified hazardous areas.
- ISO 5211 output flange for compatibility with standard ball and butterfly valves.
- Torque range from approximately 50 Nm to 2,400 Nm; rotation angle 75° to 105°.
- IP68 protection class with high-quality corrosion protection.
- Three-phase AC motor with handwheel for manual operation and mechanical position indicator.
- Compatible with AUMA MATIC ACExC 01.2 explosion-protected controls for integral local control.
- Optional intermediate position switches, tandem switches, remote position transmitters, and magnetic limit/torque sensing.
Industrial Applications
The SQEx actuator is deployed wherever a ball or butterfly valve requires certified explosion-proof automation, including refinery tank farms, pipeline manifolds, gas processing plants, and offshore platforms handling flammable liquids or gases. Its ISO 5211 compatibility and proven AUMA platform make it a straightforward specification for projects standardizing on a single actuator family across both multi-turn (SAEx) and part-turn (SQEx) hazardous-area valve automation needs.
Seven Star LLC supports refinery engineering teams, EPC contractors, and plant maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of AUMA explosion-proof part-turn actuators, helping projects meet hazardous-area compliance requirements for their quarter-turn valve automation.
Technical Specifications
The table below summarizes the core specifications of the AUMA SQEx Explosion-Proof Part-Turn Actuator as supplied by Seven Star LLC.
| Parameter | Specification |
|---|---|
| Model | AUMA SQEx Series |
| Type | Electric, explosion-proof, part-turn actuator |
| Standard | ISO 5211 output flange |
| Motor | Three-phase AC |
| Protection Class | IP68 |
| Torque Range | Approx. 50 Nm to 2,400 Nm |
| Rotation Angle | 75° to 105° |
| Operating Time (90°) | Approx. 4 to 100 s |
| Ambient Temperature | -30°C to +60°C |
| Explosion Protection | ATEX / IECEx / regional hazardous-area certification |
| Manual Operation | Handwheel with mechanical position indicator |
Why Choose Seven Star LLC for Explosion-Proof Actuator Specification
Getting the certification match right on an explosion-proof actuator is not optional paperwork – the SQEx must be specified against the exact zone classification, gas group, and temperature class of the installation, and a mismatch between actuator certification and area classification is a compliance failure that surfaces during a safety audit, not at commissioning. Seven Star LLC’s engineers confirm the customer’s classified zone requirements and valve torque needs before the SQEx is ordered, and help select between explosion-proof open-close duty and the modulating SQREx variant depending on the control philosophy required. We also help plan spare parts and AUMA MATIC ACExC controls pairing for facilities standardizing actuator platforms, and coordinate delivery for tank farm and pipeline manifold projects across Muscat, Sohar, and the broader GCC.
Request a Quote for AUMA SQEx Explosion-Proof Part-Turn Actuator (ATEX)
Seven Star LLC supplies the AUMA SQEx explosion-proof part-turn actuator with full manufacturer documentation and regional technical support. Contact our instrumentation and valve automation division for a formal RFQ, to confirm the correct actuator size and certification for your classified zone, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine, correctly configured, and backed by local engineering support.
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- Datasheet AUMA SQEx 05.2 - SQEx 14.2 Datasheet Download
AUMA actuator and gearbox types
SA multi-turn actuators handle open-close duty on gate and globe valves, and SAR is the modulating version; the listing includes the SA 07.2, SA 10.2 and SA 25.1. SAEx and SAREx are the explosion-proof equivalents. Part-turn duty on ball and butterfly valves is covered by SQ and the modulating SQR, or by an SA actuator combined with a GS part-turn gearbox. LE linear thrust units convert multi-turn output to thrust, and GHT multi-turn gearboxes extend the torque range up to 120,000 Nm. PROFOX is the compact actuator line. Special items include the seawater-resistant SGM and SGMR part-turn actuators with bronze housings, the SVC and SVCR globe valve actuators and the FQM fail-safe unit. Integral controls come as AM or AC versions.Where AUMA electric actuators are used
AUMA actuators are found in water, power, oil and gas, marine and general industry. In practice that means isolation and control valves in water treatment and pumping stations, power plant steam and cooling systems, tank farms and pipelines, and sluice gates and dampers.Ordering AUMA actuators and parts: what we need
For a replacement send photos of the actuator, motor and controls nameplates: type, order number, serial number and wiring diagram number. For a new actuator we need:- valve type, required torque or thrust, and turns or stroke
- valve mounting flange and stem or shaft details
- output speed, duty (open-close or modulating)
- supply voltage and frequency, control signals or fieldbus
- enclosure protection, ambient temperature, Ex requirement
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